The electromagnetic spectrum includes microwaves and light. The light that we see is made up of lots of different colours. Each colour has a different wavelength. Red light has a longer wavelength than the other colours. Violet light has a shorter wavelength than the other colours. The longest waves in the electromagnetic spectrum are radio waves that are used to carry signals for AM radio, TV and FM radio. Electromagnetic waves that are a few centimetres long are called microwaves and are used to heat food and transmit telephone signals over a distance. We feel the heat from sunlight, a fire, a radiator or a warm sidewalk because of infrared waves. The only part of the electromagnetic spectrum we can see is visible light, but some insects can see ultraviolet waves too. X-rays have more energy than light because they have a shorter wavelength. X-rays can be sued to see the bones in your hand. The shortest wavelength in the electromagnetic spectrum are gamma rays which are produced in radioactive atoms and in nuclear explosions.
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